package com.lcicl.reggie.filter;
/*
  Date: 2023/07/23
  Author: Luochao
  Description:
*/

import com.alibaba.fastjson.JSON;
import com.lcicl.reggie.common.BaseContext;
import com.lcicl.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截路径为：{}", requestURI);
        //不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/logout",

                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }

        //4、判断登录状态，如果已登录，则直接放行
        Object employee = request.getSession().getAttribute("employee");
        Object user = request.getSession().getAttribute("user");
        if (employee != null) {
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);     //线程local
            filterChain.doFilter(request, response);
            log.info("员工：{}   已登录,放行", empId);
            return;
        }
        if (user != null) {
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);     //线程local
            filterChain.doFilter(request, response);
            log.info("用户：{}   已登录,放行", userId);
            return;
        }

        //5、如果未登录则返回未登录结果,通过输出流方式向客户端响应数据
        //todo 项目开发完成后改回来
//        filterChain.doFilter(request, response);
//        log.info("本次请求：{}   未登录,但是放行",requestURI);
//
        log.info("本次请求：{}   未登录", requestURI);
        response.getWriter().write(JSON.toJSONString(R.error("NOT LOGIN")));
        return;


    }

    public boolean check(String[] urls, String path) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, path);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
